"The GNU General Public License (GPL) is one of the most widely
used software licenses--and, undoubtedly, the most misunderstood.
Some of this misunderstanding comes from hostile propaganda, but
some also comes from a lack of experience in licensing issues on
the part of both lawyers and lay users, and the use of standard
language in conventional end-user license agreements that are
unthinkingly coupled with the GPL. In all cases, the confusion is
frequently based on misreadings, rumors, secondhand accounts, and
what is convenient to believe.
"To get a sense of the most common misunderstandings, NewsForge
consulted with three experts: Richard Fontana, a lawyer with the
Software Freedom Law Center and one of the main drafters of the
third version of the license; David Turner, former compliance
engineer at the Free Software Foundation who is assisting with the
revisions of the license; and Harald Welte of the GPL-Violations
project, which tracks possible cases of non-compliance and tries to
assist in resolving them..."